Around what age did Einstein start speaking?

Correct answer: At about two and a half years

The correct answer is about two and a half years. The lesson describes Einstein’s late speech as an unusual detail of his early childhood. His parents were concerned because he did not begin speaking at the age commonly expected, and this contributed to the impression that he was different from other children. The fact should not be interpreted as evidence of low intelligence; it is simply a biographical detail about his early development. Six months is much too early for the event being described, while ten and fifteen years are much too late and are not stated in the chapter. Therefore, option A is the accurate answer.